mozilla-extension-manager fails to retrieve em:id with tree style tab addon about ubuntu-scripts

[NicolasBernaerts]

This extension manifest is malformed.

<RDF:RDF>
<RDF:Description RDF:about="urn:mozilla:install-manifest" em:id="[email protected]" em:name="Tree Style Tab" em:version="0.17.2016061501" em:creator="YUKI "Piro" Hiroshi" em:description="Show tabs like a tree." em:homepageURL="http://piro.sakura.ne.jp/xul/_treestyletab.html.en" em:iconURL="chrome://treestyletab/content/res/icon.png" em:optionsURL="chrome://treestyletab/content/config.xul" em:type="2" em:multiprocessCompatible="true">

All other extensions manifest look like :

<RDF>
<Description about="urn:mozilla:install-manifest">
<em:id>{ada4b710-8346-4b82-8199-5de2b400a6ae}</em:id>
<em:name>ReminderFox</em:name>
<em:version>2.1.5.5.3</em:version>

That's why it is not read properly.